diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index d86f9d5a220..f9f8fb4a419 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -31881,7 +31881,8 @@ bool X86TargetLowering::SimplifyDemandedBitsForTargetNode(
     KnownBits KnownOp;
     SDValue LHS = Op.getOperand(0);
     SDValue RHS = Op.getOperand(1);
-    APInt DemandedMask = OriginalDemandedBits & APInt::getLowBitsSet(64, 32);
+    // FIXME: Can we bound this better?
+    APInt DemandedMask = APInt::getLowBitsSet(64, 32);
     if (SimplifyDemandedBits(LHS, DemandedMask, KnownOp, TLO, Depth + 1))
       return true;
     if (SimplifyDemandedBits(RHS, DemandedMask, KnownOp, TLO, Depth + 1))